Inductive controlling apparatus.



A. SUNDH.

INDUGTIVE GONTROLLING APPARATUS.

APPLIGATION.I`ILED MAB.. l, 1910.

Patented Feb. 11, 1913 I F '3' ummm A. SUNDH.

' INDUGTIVE GONTROLLING APPARATUS.

APPLICATION FILED MAR. 1,1910y Patented Feb. 11, 1913.

2 SHEET S-SHEET 2y HHHHHH SHOM/ww trolling apparatus and one ofits objects is sfrA'rEs PATENT oEEicEl AUGUST sUNDH, oE-YoNKERs, N'Ew YORK, AssIGNR To o'rrs ELEvA'roR coMrANY,

' 0E JERSEY-CITY, NEW JERSEY, A coRroRA'rroN or NEw JERsEY. c iNDUc'rIvE coN'rRoLLrNG APPARATUS.

111,052,528: Y ASS'pvecication olf Letters Patent. `Pafe11ted 1913, l

Application filed March 1, 19110. `Serial No. 546,607.

the motor circuit extending from the sec-A ondary winding of the transformer -F. H is a manuallyl operated controlling switch comprising a switch lever 3 pivoted at 1l and having. a slot 8 into which extends'a 60 pin 9 fastened to the horizontal bar 10. To v 'the ends of this bar are connected laminated cores 6 and 6 which eX-tendlsubstantially halfl way into the windings or lsolenoids 5 and 5, respectively, 'The lower end of the 65 lever 3 i's provide with 'a pointer v12, the.

To all whom t may concern-:

Be-it known .that 1,' AUGUST SUNDH, a .citizen of the United States, vresiding at Yonkers, in thecounty of' Vestchester and 5' State ofV New York, haveinvented va newi and useful Improvement in Inductive Controlling Apparatus, of which the following isa specification. v .f My invention relates 'to' an inductive conthe provisin of means'dependent upon in-` have also shown avswitch of this kind used slowmovement of the gear. 17 will cause 85 to control an electric motor system.` the vane 28 te rotate rapidly and thusv gen- Obviously the inventionl maybe used in erate considerable friction against the air. the control of numerous other electro-me- Tlieconductor. 1 is commoirto one termichanical devices located at a distance from nal of each ofthe solenoids or coils 5 and 5 the master switch, as the inductanceof `a and is connected to one side'of the main 90 circuit, and consequently ethe impedance, line switch S. The other side of this switch maybe taken advantage of to 'effect mechaniis connected by' the conductor 2 to one tercal motion to operate'any/ mechanical or minal of each of thejsolenoids'14 and 14. `electro-mechanical devicewhich 'is located The solenoid 14 isconnected Iin scricswith 40 near or at a distance from the master switch. the solenoid 5 and the solenoid 14 is con'-` 95 In the accompanying drawings Figure 1 nected in series with-the solenoid 5. By shows an inductively controlled indicator; virtue of these connections two parallel cir- Fig. 2 is a fragmentary view showing a cuits are established, one including the solemoditication of certain parts of Fig. 1; Fig. noids 5 and 14 and the other the solenoids 3 shows my invention `applied to a motor 5 and 14. lVhen the parts assume the po- 100 control system`; and Fig. 4 shows the appli' sitions shown in Fig. 1 the sums of the cation of my invention to an elevator sysohmicresistance andimpedance -in the retem. spective parallel circuits are' substantially Similar reference characters denote simithe same, andtherefore the current How in lar parts'throughout the different views. .each parallel-branch will be substantially 105 Referring to Fig. 1, F designates a transthe same and both'sides willbe in electrical former connected vto conductors leading balance. from a source of alternatingcurrent supln order to explain the operation the ply, and also connected'to the main line controlling apparatus let itbe' assumed;A that vductance to control any desired apparatus. Otherobjects of the invention will-appear more fully hereinafter, the novel combina tions of elements being-pointed out in fthe appended claims. l With my apparatus the .inductance linan alternating current circuit or circuits may be controlled or varied by either manual or .automatic means located at one place in the circuit or circuits, and the variation in the inductan'ce used to control or operate the various mechanical or' electrical devices located at distant points in the circuits. As an examplefoffa practical application of my invention, I have shown a. manually operated inductive master switch or controller used to control an indicator located at a distance from the master switch. l

' switch S which controls the continuity of Ymovementof which in'either .direction is indicated on a scale 13., is an indicator or electro-respons1vedevice comprising a gear 17 pivoted at 18 and .having an upwardly 70 extending l-shaped arm 16 to-which are attached laminated cores 15 and l5. Eachf of the latter extends part way, preferablyv4 substantially half way, into thesolenoids 14 and 14, respectively.' The gear 19 pivoted 75 at 20 meshes with the gear 17 and carries a pointer 21 which' is arranged to move over a scale 22p The gear 17 is in mesh also with thelgear 23 'on the shaft 25 whichv is connected to a largerl gear 24, and the latter is in mesh with a smaller gear 26 carrying a vane 28. This train of gears acts as a retarding device to check the move-V ment of the gear. 17, since a comparatively the switch liever 3 is moved a short distance l'il to the right by means of the insulated handle 4 until the pointer 12 points to the fig-- ure 2 on the scale 12. As the switch lever is moved the bar 10 is also moved by reaso-n of the pin-and-slot connection between the two. Thus an additional portion of the core `6 is projected into the solenoid 5 while a corresponding portion of the core G is withdrawn from the solenoid 5. The current in the parallel circuit is no longer the same, since the impedance of the circuits containing the solenoids 5 and 14 is lower while the impedance of the parallel branch containing the solenoids 5 and 14 is increased, and for this reason the current now flowing in the latter is less than the current flowing from the solenoids 5 and 14. .This is for the reason that the less the reluctance for the lines `of force of the solenoid 5, the greater will he the inductance and consequently the greater the impedance. Therefore when the core 6 is projected farther into the solenoid -5"the magnetic reluctance is decreased, theinductance is increased and consequently the impedance to the yllow of alternating current is increased. In a similar manner, when the A core 6 is withdrawn from the 'solenoid 5 the reluctance to the lines of force is increased, the inductance is decreased and the yimpedance is also decreased so that more current can flow through the solenoid 5.

I t is readily seen that the magnetic pull of the solenoid 14 will therefore be great-er atthis time than the pull of the solenoid 14 by reason of its greater strength, and there!y the parallel branches is again establishedand the gear 17 and its connected parts willv therefore come gradually to rest. A further movement 4of the switch handle 4 to the right'will at once upset or disturb this electrical balance by altering the relative yimpedance of the parallel branches and the pointer 21 will again be moved along the scale 22 in a left hand direction until this balance is again established, when the pointer will come to rest substantially at a point on the scale 22 corresponding to that of the pointer 12 on the scale 13.

If the switch lever 3 is brought back to its initial or vertical position, the impedance of the solenoids 5 and 5 is again the same but the current in each is not the same, since .at this time the solenoid 14 contains a with its connected parts will be moved back to a central Orvertical position, which operation again places the system in electrical and mechanical balance.l

Should the switch lever`3 ybe moved to the left the responsive device I would at once operate to move its pointer 21 to the right a `corresponding amount, or until the balance which is disturbed every time the 4switch 4 is operated has automatically been restored by the responsive device I. Thus it is seen that for any movement of the switch H a corresponding movement of the responsive device I takes place.

Instead of using a train of gears and connected vanes to produce a damping or retarded movement :of the arm 16 and the cores 15, 15, I sometimes use'the mechanism illustrated in Fig. 2. Here a racl23 meshes with the gear 17 and carries vat its lower end a piston 29 arranged to move in a closed cylinder 30 provided at either end with ports which are in communication with cach other through a by-pass 33 having an adjustable valve 34, by means of which the passage of fluid from one port to the other may be regulated. This cylinder may contain air, oil or any other suitable fluid, the object being to check the free movement of the piston 29 as the latter displaces the fluid contained in the chambers 31 and 32, causing itA to flow through the by-pass pipe and valve 34. By adjusting the valve 34 the retardation of the piston 2S) may be increased or decreased to any desired extent. These'retarding devices are shown merely .for the purpose of illustration, as any otherV suitable retarding device may be used if desired. j.

The apparatus shown in Fig. 3 comprises two direct current electric motors with their armatures A and B and series lieltl windings 39 and 39, respectively. N is a rheostat controlled by the responsive device I comprising a sectional gear 19 pivoted at 20 and in mesh with the gear 17. To the sectional gear 19 is connected a contact-carrying arm 21', to the outer end of which is connected the resistance-'varying member 35, but the latter is insulated from the arm 21 as shown. This resistance-varying member 35 is in electrical and sliding contact with the arc-shaped conducting strip 3G and a series of stationary contacts 37, se, 40, 4i, 4.2 and ss, 40, 4r, 42. A le sistance R is connected at its opposite ends to the contacts 42 and 42, and the remaining contacts of the series are lconnected at intervals to-this resistance. The circuit for Athe motors extends from the Vsource of current supply throughthe positive main, and thence through both armatures A and B in parallel and in the same direction and through the series Jields 39 and. 39 in op-v posite directions, and then through the conductors 47 and 47' to the opposite ends of the resistance RQ An intermediate pointof this resistance,. .preferablythe middle point,

is connected by the .contact 37, resistancevaryingmember -and contact strip 36 to thel conductor 48 .whichlead s to the nega; tive main', the latter being connected to the source of current' supply. Thus the motorsv are connected in arallel with a portion of the resistance- R 1n circuit with each. The motor fields, however, receive current in opposite directions so. that the Amotor 'armatures will rotate in opposite directions. lf

vthe arm 16 which carries lthe cores 15 and '15', as illustrated in lFig. l, bejmoved to the right, the arm 21 isalso moved to the right until the resistance-varying member 35 elec- .'trically connects the contact 38 and the strip s36, the' sections 4 3 of the resistance R will be included in the circuit' of the motor armature A and at the. same ltime' removed from' they circuit of the armature B. This will cause the motor rmatureA to decrease in the speed of rotation and the armature B will increase its speed of' rotation. Upon further movement of the 'arm 21 in the same 7direction a still greater relative di'erence in the motor speeds isproduced. lf the arm2l ismmoved back to center or to its vertical position the motors will again run at substantially the same rates ofspeed, and if'fmovediove'r to the left the motor armature A will runfaster while the armature B will run more slowly.

The devicey described is particularly vadapted to theI elevator apparatus `shown in- Fig. '4 in which C designates an elevatorl car suspended .bya cable or cables L which passes over a sheave M and is connected toa cunterbalance weight vW. Another cable or cables=Flis also connected to this counweight W andthe latter to the tension deterrbalance 'weight-mhd passes over ,the sheaves '-M and-GV and isconnected to a tension devioeflf,4 Aand B` are driving pulleys Lconnected .to the motor armatures A and B. E and Y are traveling pulleys, the former being attached to the counterviceT. An endless Acable or cables D passes around both of the driving pulleys A and 4 B and also around'both of thetraveling so pulleys E and Y. The former driving pulleys and the motors which 'are connected thereto and the Vendless cable are so arranged that each of' them continues to run in one direction without lstopping or reversing motion ,vwhile the elevator car will. either wardlypr downwardly, as desired. Vhen the circumferential speed of the two driving` pulleys is the'same and they rotate in opposite directions, the car will remain stationary. iVhen it is desired to move the car upwardly vor downwardly t-he relative rate of circumferential speed of the driving pul- `leysis variedso that one driving pulley will run slower orl faster than the other, whereupon the elevator car will be moved. upwardly or downwardly according to which one of the driving pulleys is given the' greater circumferential velocity.

vWhilel have shown in Fig. 3 a direct cur- :rent,motor-controlling apparatus, my invent-ion is also adapted to alternating current motors of any desired type, and although lhave shown a method of controlling-motors by varying t-he series resistance, the relative strengths of motor shunt fields may be `varied instead, or, both the field strength and armature potential may be varied so as to produce a change in speed.

YWhere my inductive controlling apparatus is used in the operation of electric elevators it is desirable to locate the master remain stationary or will be moved upswitch H in the car, sothat the entire operation of starting, stopping-and reversing the motion of the elevator-car may be controlled from the latter. v

From the foregoing it is evident that my invention furnishes an efficient and simple means for veffecting the control and opera- .tion of various kinds of apparatus atea distance without employing any switches which must-be opened and closed during normal operation'vof starting and stopping: This is particularly important in alternating vcurrent apparatus where it is diflicult to secure firm electrical connections at the switch contacts, and to prevent noise or chattering due to alternations off'magnetism in electromagnet actuating devices for the switches.l

W'hile l have described the operation of my invention in connection with an indicating responsive device and` awell known type .of elevator apparatus, 'l do not wish to be limited to such application.- Furthermore, 1t 1s obvious that various changes 1n the Ivarying the relative inductance'in the cii-,

cuits, and an electro-responsive device operated by such varlatlon.

2. 'llhe combination W1th electric circuits y1 15 details and arrangementof' parts may be `made by those skilled in the artwithout and a source of alternating current supply, of inductance coils iii said circuits, manually controlled means for varying the inductances in the circuits, and a magnetically balanced electro-responsive device in one of the circuits. y

3. The combination with electric circuits and a source of alternating current supply, of inductance coils in said circuits, manually controlled means for varying the inductances in `the circuits and a magnetically balanced electro-responsive device operated by such variation.

4. rlhe combination with electric circuits and a source of alternating current supply, of inductance coils in the circuits, means for varying the relative inductance in the coils, and an electro-responsive device operated by such variation; l

5. The combination with parallel electric circuits and a source of alternatingcurrent yply, of inductive resistances in the circuit,

means :tor'varying one of said resistances to vary the inductancein the other resistance, Vand an electro-responsive device operated by the variation Lof the inductance in thesaid other resistance.

8. The combination with an electric circuit and a source of alternating current 'supl ply, of inductaiice coils in the circuit, magnectic cores for the coils, manually-operable means for-varying the relative position of one of the coils and its core to vary the inductance and current strength in the-circuit, means 'for holding the other magnetic core yieldinglv balanced against the magnetic pully of its coil,:and a movable element operatively connected to the last named core and movable into positions determined by the varying positions assumed by said core as the current strength is varied. i

' 9. rthe combination with a source of alternating current supply and a divided circuit, of an inductive resistance in each branch of the circuit, means for increasing the inductance in one circuit and decreasing the inductance in the other circuit, and an electro-responsive `device controlled by the variation of inductance in the circuit.

alternating current supply and a divided circuit, of means for simultaneously increasing and decreasing the inductance in the respective branches of the circuit, and an electro-responsive device controlled by the variation of inductance in the circuit.

11. The combination With a source of current supply and a ,divided circuit, of means for simultaneously increasing and decreasing the resistance in the respective branches of the circuit, and an electro-responsive device controlled by the variation of the resist-ance in the circuit.

12. The combination with a source of alternating current supply and a divided circuit, of two inductive resistances in each' branch of the circuit, means for simultaneously increasing the impedance in a coil of one branch and decreasing it in a coil of the other branch, .to vary the current in the branches, and an electro-responsive device operated by the-variations o inductance in the other resistances as the current varies.

13. The combination with a source of alternating current supply Aand a divided circuit, of an inductance coil lin each circuit, a movable member held in a balanced position by the magnetic pulls of said coils, and means for varying thecurrent strength in the circuits to disturb lsaid balance and cause said member to move.

lll. The combination With a source of al-y ternating current supply and aldivided circuit, oit an iiiductance coil in each circuit, a

,movable member located between the coils,

rium between the magnetic. pullsiof the coils and the cores, an'd "means for varying the relative current strength in the circuits.

1,5. rlhe combination With a source .of l

alternating current supply anda divided circuit, of inductance coils in each branch of the circuit, a movable member between coils respectively in the branches of said circuit, magnetic cores connected to said member and extending into the coils, a second movable member located between other coils respectively in the branches of said circuit, magnetic cores connected to said member and extending into said' last-named coils, said second member being held in a position of equilibrium by the magnetic pulls of the coils on the cores', and ymeans, for moving said I first member to vary the relative current strength Vin the jcircuits and disturb -the equilibrium of the second member. y

1G. The combination with a source of ated by said member to vary the'induc'tance inthe circuit,` al second member, and means operated only by the variation of the induct ance to cause a` movement of the second I member proportional to the movement of the iirst member.

17. rIhe combination with an electric circuit and a source of alternating current supply, of a movable member, an inductance coil in the circuit, means for varying the inductance'of the coil -upon the movement of said member, a second inductance coil in the circuit, a second member movable independently of the first, and means operated by the variation of inductance in the second coil for causing a movement of the second member proportional to the movement of the first member.

18. The combination with a divided circuit and a source of .alternating current supply, of an inductance coil in each circuit, magnetic cores for the coils, normally-operable means for simultaneously moving the coresso that the inductance of one coil is increased and that of the other decreased, a second coil in .each circuit, magnetic cores therefor, a movable` member connected to said last-named cores, said cores being movable upon the variation of inductance in the circuits to' give said member a movement proportional to the movement of the operating means. i 4

19; The combination with a source of alterna-ting current supply and a divided circuit, of an inductance coil in each circuit, a movable member located between the coils, magnetic cores carried by said member and normally extending partially into the coils,

-means for moving sald member n either direction to vary the inductance on the circuits, a second coil in each circuit, a movable member located between said coils, magnetic cores carried by the second movable member and normally extending partially into the coils, said member being balanced by the magnetic pulls of the coils and movable when the balance is disturbed by the movement/of the irst member into a position corresponding to the changed position of the first member.

Q20. The combination with a source of alternating current supply and an electric circuit having parallel branches,` of means "for varying tlievre-lative inductance 1n said branches, an electro-responsive device oper- -able by the variation of inductance, and means for retarding or dampening the movement of said device.

21. The combination with a source of alternating currentsupply and an electric circuit having parallel branches, of means for varying the inductance in said branches, of the circuit, an electro-responsive device movable upon the variation of the inductance, and retarding mechanism connected to' said electro-responsive device.

22. The combination with electric circuits and a. source of alternating current supply, of inductance coils in said circuits, means for varying the inductances in the circuits, an electro-responsive device operated by the variation in induct-ance, and a rheostat operatively connected to said electro-responsive device.

23. The combination with a manuallyoperable member, of inductive electric circuits, means operated by the said member to vary the inductances in the circuits, an electro-responsive device operable upon the variat-ion of theinductance, and a rheostat having its movable member operatively connected to the electro-responsive device, and movable upon the operation of the manuallyoperable member.

' 24. In an elevator system, the combination with a load-carrying device, an electric motor and operative connections between the motor and load-carrying device, of a source of current supply, parallel electric circuits, manually-operable means for varying the relative inductance in said circuits, an elec- 'tro-responsive device operated by said variation, and means operated by said elect-roresponsive device for controlling the motor.

25. The combination with an electric circuit and a source of alternating current supply, of means for varying the inductance in the circuit, a manually-operable member connected to said means, an indicator associated with said member, an electro-responsive device operable upon the variation of inductance in the circuit, and an indicator associated therewith.

26. The combination with an electric circuit-and a source of alternating current supply, of inductance coils inthe circuit, a magnet core movable in said coils to vary the relative impedance of the-coils, a manually operable lever connected to the core,.and an electro-responsive device in the circuitl and controlled by such variations.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

AUGUST SUNDH.

Witnesses:

JOHN F. RULE, JAMES Gr. BETHELL. 

